Step 1. Launch the program and then click "Add File(s)..." button to load the source video files to be converted:

Step 2. If you want to edit the video, please click the "Edit Start Time and End Time..." button to edit the selected video. Slide the Slider Bar to select where you want the new clip to start from, and then click the 'Mark Start Time' button to mark the start point. Next, move the Slider Bar until it reaches where you want the video clip to end and click the 'Mark End Time' button.

Step 3. Click the "Add Subtitle..." button to add the subtitle onto the selected video, if you need: